Ru·in·ous a.
1. Causing, or tending to cause, ruin; destructive; baneful; pernicious; as, a ruinous project.
After a night of storm so ruinous. --Milton.
2. Characterized by ruin; ruined; dilapidated; as, an edifice, bridge, or wall in a ruinous state.
3. Composed of, or consisting in, ruins.
Behold, Damascus . . . shall be a ruinous heap. --Isa. xvii. 1.
Syn: -- Dilapidated; decayed; demolished; pernicious; destructive; baneful; wasteful; mischievous.
-- Ru*in*ous*ly adv. -- Ru*in*ous*ness, n.
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ruinously
adv : in a ruinous manner or to a ruinous degree; "ruinously high
wages"